Report "Engine starts fine, and runs fine, until you start up the slightest incline. Starts spitting, missing, and will stop altogether within 10 to 15 seconds,unless you get it level again. Drained fuel tank, dried it out, refilled with new fuel, checked lines, all are open, checked filter, it is ok, pulled front plate of of carb, cleaned and put back. Replaced air filter, cleaned and regapped plugs. It makes no difference if mower is running or not, it acts the same. Does just fine on level ground. If it stops, just wait about 5-10 seconds, it will start right back up as long as it is level"